McLachlan left the stage show mid-January amid allegations of sexually inappropriate behaviour.

Craig McLachlan will be taking legal action against Fairfax Media and the ABC. Picture: Tim Hunter.

It came after three women - Christie Whelan Browne, Angela Scundi and Erika Heynatz - who appeared in the 2014 production of the Rocky Horror Picture Show told the ABC McLachlan inappropriately touched them or exposed himself. A woman and a man who worked as part of the crew have also gone to Victorian police, who are investigating the allegations.

McLachlan and his partner Vanessa Scammell. Picture: Tim Hunter.

McLachlan says he doesn't understand why the allegations were made. "By God I will fight this," he told The Sunday Telegraph.

Producers of the popular TV show The Doctor Blake Mysteries in which McLachlan stars have also temporarily halted preparations for the new series on the Seven Network while the allegations are investigated.

Cast and crew of the TV show have reportedly revealed claims of McLachlan's on-set behaviour, including an alleged incident where he held a banana to his crotch and thrust it into the face of an actor.